Heat exchanger



May 25, 1937. c. F. ROSENBLAD HEAT EXCHANGER Filed March 4, 1936 2 Sheets-Sheet l May 25, 193?. c. F. ROSENBLAD HEAT EXCHANGER Z'Sheets-Sheet 2 Filed March 4, 1936 Patented May 2 5, 1937- UNITED STATES PATENT OFFICE HEAT EXCHAN GER Application March 4, 1936, Serial No. 67,153 In Sweden March 4, 1935 9 Claims.

This invention relates to heat exchangers of the regenerative type for indirect heat exchange between two fluids and especially for heat exchange between noncondensable gases. In such cases the volumes of the gases are generally very large and, therefore, the channels for the gases have tobe relatively short, and these circumstances have until now made it diflicult to constructa compact apparatus suitable for the purpose.

The main object of my invention is to provide an apparatus having a superior efficiency of heat transmission and yet being of smaller dimensions than any type of such apparatus heretofore used.

Another object of the invention is to provide a successive narrowing of the channels for the fluids towards the centre of the apparatus in order to effect the highest possible heat transmission efficiency, even though the diameter of the central part be small.

Some embodiments of my invention are shown in the annexed drawings.

Fig. 1 is a, plan view of one embodiment of the apparatus;

Fig. 2 is a sectional view taken on the line 11-11 of Fig. 1; a

Fig. 3 is a similar sectional view showing a modified embodiment of the apparatus;

Figs. 4 and 5 are plan views of other modified embodiments of theapparatus; and

Fig. 6 is a detail view.

According to Fig. 1 the heat transmitting surface is formed by a series of concentric circular cylinders i, made of sheet metal. The cylinders are flanged at 2 and 3 alternately at opposite [ends and the flanges are connected, for instance by welding or soldering, to the corresponding edges of adjacent cylinders. In this way there are formed'two series of channels of which the channel series l is open at its upper end and closed at its bottom end and separated from the channel series 5 which is open at its bottom end and closed at its upper end. In its centre and around its periphery the apparatus is provided with an inner mantle 6 and an outer mantle l, and these mantles are provided with flanges 8 and Bio! securing covers l and ii to the upper and bottom ends of the apparatus. On said covers there are arranged pipe connections I3, Hi, l and It, for instance, as shown, two by two diametrically opposite to one another, and forming inlets and outlets for fluids. In order to decrease the loss of pressure of the fluids at the inlets and outlets the channels are, at the same preferably provided with guiding bars 11 (Fig. 6 of round or flat bar iron.

The function of the apparatus is as follows:

Hot gas enters through the inlet connection I3 of the upper cover and is in the channels 4 distributed in opposite directions, flowing through said channels and escaping. through the opposite outlet connection l4. Simultaneously, the gas to be heated enters through the connection [5 of the bottom cover and is in the channels 5 distributed in opposite directions, flowing through the same and escaping through the opposite outlet connection Hi. In order to provide a uniform flow of the gas, the connections l3, l4, l5 and I6 are suitably fastened to the covers by means of sector shaped connecting parts l8. As the distance to be covered by the gas is much longer in the outer channels than in the inner ones the space between the plates is conveniently successively increased from the centre towards the periphery of the apparatus. By this arrangement such apparatus can be built with a rather small inner diameter and consequently less spacious, nevertheless having the best efiiciency possible.

vIn the apparatus now described, the distance to be covered by the gas is half the circumference of the apparatus. However, it is possible to make said distance almost equal to the entire circumference by arranging the corresponding inlet and outlet connections adjacent to one another and providing necessary vertical partitions IS in the channels. Such arrangement is illustrated in Fig. 4, according to which the cylinders I are by way of example oval.

Instead of concentric cylinder plates there can also be used two or more spirally wound plates, forming two or more parallel spiral channels, of which juxtaposed channels are closed, e. g. by welding, at different face ends, i. e. one of said juxtaposed channels is closed at the face end at which the other one is open.

Such an apparatus is illustrated in Fig. 5. The sheet metals 2! and 22 are bent spirally to form parallel spiral channels 23 and 2 5 for gases exchanging heat.

Possibly, as shown in Fig. 3, one half of every channel system can be closed at the upper end and the other half at the bottom end, in which case the connections l3 and it may, for instance, serve as inlets and the connections I5 and I6 as outlets for the gases. Thus the gas entering at l3 will be discharged at l5 and the gas entering at It will be discharged at It. Possibly, however, the connections l3 and [6 may serve as inlets and the connections l6 and I5 as outlets.

'Moreoyer, the plates may be formed in any desired manner within the scope of the invention, as. heretofore set forth, provided they are arranged edgewise and mainly parallel and that their edges are alternately connected to one another.- I

I claim:

1. In an apparatus-for exchanging heat between fluids, curved heat transmitting plates arranged edgewise and extending alongside one another, face covers on edges of said plates. inlet connections and "outlet connections on said covers, said edges being alternately connected by pairs to one another so as to form separate channel systems'each of which is open towards one cover and closed at an opposite face end, said channel systems being connected each to one of said inlet connections and one of said outlet connections.

2. In an apparatus for exchanging heat between .fluids, a series of sheet metal cylinders one arranged within another, covers on the edges of said cylinders, inlet connections and outlet connections on said covers, said edges being alternately connected by pairs to one another so as to form separate channel systems each of which is open towards one cover and closed at an opposite face end, said channel system being connected each to one of said inlet connections and one of said outlet connections.

3. In an apparatus for exchanging heat between fluids, a series of oval sheet metal cylinders, one arranged within another, covers on the edges of said cylinders, inlet connections and outlet connections on said covers, said edges being alternately connected by pairs tovone another so as to form separate channel systems each of which is open towards one cover and closed at an opposite face end, said channel systems being connected each to one of said inlet connections and one of said outlet connections.

4. In an apparatus for exchanging heat between fluids, a series of spirally shaped heat trans-. mitting plates arranged edgewise and extending alongside one another, covers on the spiral edges of said plates, inlet connections and outlet connections on said covers, said spiral edges being alternately connected by pairs to one another so as to form separate channel systems each of which is opentowards one cover and closed at an opposite face end, said channel systems being connected each to one of said inlet connections and one of said outlet connections.

v5. In an apparatus for exchanging heat between fluids, curved heat transmitting-plates ar ranged edgewise and extending alongside one another, face covers on edges of said plates, inlet connections and outlet connections on said covers, said edges being alternately connected by pairs to one another so asto form separate channel systems each of which is open towards one cover and closed at an opposite face end,

said channel systems being connected each to one of'said inlet connections andone of said outlet connectionathe outlet connection and the inlet connection of a channel system being disposed on opposite sides of the centre of one cover.

6. In an apparatus for exchanging heat between fluids, curved heat transmittingplates arranged edgewise and extending alongside one another,

face covers on edges of said plates, inlet connections and outlet connections on said covers, said edges being alternately connected by pairs to one another so as to form separate channel systems each of which is open towards one cover and closed at an opposite face end, said channel systems being connected each to one of said inlet connections and one of said outlet connections, the outlet connection and inlet connection of a channel system being arranged on one cover adjacent to one another.

7; In an apparatus for exchanging heat between fiuids, curved heat transmitting plates arranged edgewise and extending alongside one another, face covers on edges of said plates, inlet connections and outlet connections'on said covers, said edges being alternately connected by pairs to one another so as to form separate channel systems each of which is open towards one cover and closed at an opposite face end and comprises a plurality of channel's said channel systems being connected each,- to one of said inlet connections and one of said outlet connections,

the width of said channels increasing towards the periphery of the apparatus.

8. In an apparatus for exchanging heathetween fluids, curved heat transmitting plates arranged edgewise and extending alongside one another, face covers on edges of said plates, inlet tween fluids, cuived heat transmitting plates arranged edgewise and extending alongside one another, face covers on edges of said plates, inlet connections and outlet connections on said covers, said edges being alternately connected by pairs to one' another so as to form separate channel systems each of which is open towards one cover and closed at an opp site face, and said channel systems being connected each to one of said inlet connections and one of said outlet connections, and curved guides for the fluids being arranged in the channel systems at the inlets and outlets.

com FREDRIK'ROSENBLAD. 

